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Control.com topic...
Sensors
Topic: Sensor technologies.
from the Real puzzler department...
Thermocouple readings problem
Originally posted by Michelle on 22 April, 2014 - 10:22 pm
Took temperature readings with J thermometer but only had K type wire!
New Replies:
what you have to be careful of is that Type-K thermocouple wire, and Type-K extension wire are two...
Another control.com thread http://control.com/thread/1336501913 involved back calculating when...
Topic: Sensor technologies.
from the Instrumentation department...
Calculating LRV/ URV of a Bubbler Level System
Originally posted by Kazim on 22 April, 2014 - 12:56 am
How do you calculate the LRV and URV of a Bubbler type Level Transmitter?
New Replies:
first find the clearance of your dip tube. say if it is 200mm. total height of the tank =...
Your bubbler can not 'see' any head pressure lower than its elevation, so you can not measure any...
Originally posted by Detlev Neumann on 17 April, 2014 - 4:09 am
Could I say that with the following facts my device is MODUS-RTU compatible
New Replies:
Agreed. Other than noting that you should be as flexible as possible on serial parameters (and...
By Lynn August Linse on 17 April, 2014 - 11:10 am -
Looks good to me, and the 'no parity' option *IS* important as some Modbus devices don't support...
Topic: Motion control, servos, steppers, etc.
from the Automation department...
Hall/Magnetic Sensor
Originally posted by Biju CG on 17 April, 2014 - 4:10 am
Hall Sensor Replacement Failed !
New Replies:
Thanks Geir. I have measured 13.5 VDC on Vcc line of the sensor from controller and same voltage on...
I can think of 4 common and several not so common output configurations for this type of sensors,...
Topic: Sensor technologies.
from the instrument department...
Dwyer flow switch information
Posted by farzadad on 21 April, 2014 - 3:42 am
dwyer obsoleted flow switch
Topic: Continuous process industries, DCS questions.
from the inst department...
Gulde control valves
Originally posted by self on 23 August, 2008 - 2:07 am
Suppliers of GULDE control valves.
New Replies:
By Dipankar Biswas on 17 April, 2014 - 11:41 pm -
> Please let me know the suppliers of GULDE make control valves. We M/s Continental Valves...
Topic: Communications systems and equipment.
from the Forum department...
MODBUS Break Condition & Checksum
Originally posted by Derek on 16 April, 2014 - 12:14 pm
MODBUS RTU using RS485 to RS232 converter connected to RS232 to USB converter to communicate with electric meter using MODBUS Poll.
New Replies:
By Lynn August Linse on 17 April, 2014 - 10:53 am -
Having the RS-485 +/- reverse (or swapped) will usually look like a BREAK condition if blindly...
Maybe try a different converter (or your current setup with another slave). FTDI sells some that...
Topic: Sensor technologies.
from the Instrumentation & Control department...
Liquid gas level measurement
Originally posted by Engineer92 on 27 March, 2014 - 2:52 am
Liquid Gas Level measurement
New Replies:
The instrument to use in a application like this is a DP with capillaries and chemical seals with...
Topic: Power generation equipment control.
from the measurments department...
Standard for temperature measurement
Posted by Mahmoud Sallam on 17 April, 2014 - 12:00 am
Location of temperature measurements (problems)
Topic: Continuous process industries, DCS questions.
from the Forum department...
Instrumentation cables sizing
Originally posted by Ahmed Sami on 10 April, 2014 - 7:57 am
Instrumentation cables sizing
New Replies:
Dear Ahmed Sami, Your question is incomplete I can say. Cable cross section and hazardous area...
Ahmed Sami, Choosing wire/cable for a particular application is a very involved process. Does...
Why do you sugget 1.5 mm2 cable? Does that follow any standards recommendation or calculations? ...
You Need at least 6x1.5mm (6 core cable)...
please note that for all your instrument devices you can use 3x1.5sqmm (3 core cable)....
Topic: Software, including programming, OS issues, etc.
from the INSTRUMENTATION department...
UREA FLOW METER
Originally posted by Arun Kumar on 14 April, 2014 - 4:20 pm
What type of flowmeter can be installed in a Urea duct as a source of FD and ID fan in the duct?
New Replies:
What are you measuring? Just air flow? We use a DP transmitter for our prill tower air ducts....
Topic: Engineering and workplace issues.
from the Level Control department...
Magnetorestrictive Level Transmitter issues
Originally posted by Braindead on 26 March, 2013 - 11:46 pm
Extreme vibration and loss of signal on level transmitters
New Replies:
Hi Mateus, there is only one instrument when you are working offshore on a FPSO or Platform...
Topic: Sensor technologies.
from the Thermocouple department...
Thermocouple cable configuration
Originally posted by Shrk on 4 April, 2014 - 7:28 am
Choosing thermocouple cable configuration- twisted pair or coaxial (multi cored)
New Replies:
please note that T/C TYPE N lower cost compensated can be used depends up on your critical...
It is seldom ever a good idea to run un-twisted pair thermocouple extension wire. Thermocouple...
Shrk, www.omega.com is a very good resource for all kinds of sensors, particularly RTDs and...
Hi. Thanks. tried looking, did not get much info. Will certainly try again. Again, thanks...
You need to use thermocouple extension wire and thermocouple terminal blocks, having the same...
Topic: Communications systems and equipment.
from the Forum department...
8-bit data types in Modbus registers
Originally posted by Jay on 10 April, 2014 - 5:26 am
Are 8-bit data types obsolete for Modbus?
New Replies:
By Lynn August Linse on 14 April, 2014 - 10:39 am -
A bit of historical trivia... Modbus never had 8-bit data types. The original PLC were made back in...
> Since registers are always 16 bits, does it even make sense to provide data types of 8 bits...
Topic: Continuous process industries, DCS questions.
from the Forum department...
Actuator indication and control
Originally posted by David Sutcliffe on 11 April, 2014 - 10:32 am
How to obtain indication and control from a Rotork actuator
New Replies:
Other types of actuators use two drive signals: - one signal drives the actuator 'open' - the...
please provide actuator model number and application...
Topic: Continuous process industries, DCS questions.
from the Forum department...
Condensate pots and flow measurement
Originally posted by Karthik on 12 April, 2014 - 3:36 am
Using condensate pots for flow measurements
New Replies:
1. The purpose of condensate pots in steam flow measurement is to isolate or seal the transmitter...
Topic: Sensor technologies.
from the maintenance department...
Process Switches NO NC definition
Originally posted by Normally on 19 August, 2011 - 7:12 pm
What "normally" means in process switches.
New Replies:
Dear Sir, Normally means then initial condition of any switch or relay without pressing or...
Topic: PLCs and related questions.
from the Forum department...
Flow Rate Calculations S7-1200
Posted by shahien on 10 April, 2014 - 3:40 am
Flow Rate Calculations S7-1200
Topic: The Business of Automation and Control
from the Investors department...
New Flow Measurement Method
Originally posted by Abdolazim Hasseli on 9 April, 2014 - 1:09 am
How to find an investor of instruments.
New Replies:
Abdolazim Hasseli... first get a reliable Patent Attorney! Do Not, repeat,...
Topic: Continuous process industries, DCS questions.
from the Forum department...
2oo3D voting
Originally posted by amanemisa on 8 April, 2014 - 3:54 am
Explain if 1oo2D voting is just similar to 2oo3 voting for ESD system.
New Replies:
Let's start with your requirement of tripping of valve on rise of line pressure beyond high limit....
Topic: Sensor technologies.
from the Density Measurement department...
Coriolis density measurement
Originally posted by Kirill St. on 3 July, 2012 - 8:53 am
Student project in coriolis density measurement.
New Replies:
If you can get it to flow, you can pump it through a Coriolis Mass Flow meter. This is the kind of...
By Avinash Bhargav on 7 April, 2014 - 2:44 am -
Dear Mr. JMW thanks for all the inputs. I have a query regarding the practical applications of such...
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